以前作成したUDPクライアント、サーバサンプルを最新化
以前のサンプルでもまだ動くが、ソース量が多く、先人のコピペによる力が大きかったので、全体を見直した。
今回の見直しを通して得た知識は特に以下３つ
- WSAGetLastErrorでは、エラーを拾えない。VBAのERRオブジェクト LastDllError から取得する。
- char * にString型で引数を与える場合は、ByvalとしてAPIを宣言する。
- non-brokingモードであれば、例えば同一シート上にUDPRecvFromとUDPSendToをボタンを設定、各々のボタンをクリックすることでUDP通信ができる。つまり１Excel上で送信と受信のデバッグ（テスト）ができる。
以下、サンプルソースコード
UDPRecvFrom を実行後 UDPSendTo を実行すると、UDP通信が確認できる。
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 |
Option Explicit '* --- FormatMessage --- */ 'FormatMessage.dwFlags Private Const FORMAT_MESSAGE_ALLOCATE_BUFFER As Long = &H100 Private Const FORMAT_MESSAGE_ARGUMENT_ARRAY As Long = &H2000 Private Const FORMAT_MESSAGE_FROM_HMODULE As Long = &H800 Private Const FORMAT_MESSAGE_FROM_STRING As Long = &H400 Private Const FORMAT_MESSAGE_FROM_SYSTEM As Long = &H1000 Private Const FORMAT_MESSAGE_IGNORE_INSERTS As Long = &H200 Private Const FORMAT_MESSAGE_MAX_WIDTH_MASK As Long = &HFF 'FormatMessage(API) Private Declare PtrSafe Function FormatMessage Lib "kernel32" Alias "FormatMessageA" (ByVal dwFlags As Long, lpSource As Long, _ ByVal dwMessageId As Long, ByVal dwLanguageId As Long, _ ByVal lpBuffer As String, ByVal nSize As Long, Arguments As LongPtr) _ As Long '* --- WSAStartup / WSACleanup --- */ 'WSAStartup / WSACleanup size Private Const WSASYS_STATUS_LEN As Long = 128 Private Const WSASYS_STATUS_SIZE As Long = WSASYS_STATUS_LEN + 1 Private Const WSADESCRIPTION_LEN As Long = 256 Private Const WSADESCRIPTION_SIZE As Long = WSADESCRIPTION_LEN + 1 Private Type WSADATA wVersion As Integer wHighVersion As Integer szDescription As String * WSADESCRIPTION_SIZE szSystemStatus As String * WSASYS_STATUS_SIZE iMaxSockets As Integer iMaxUDPDG As Integer lpVendorInfo As Long End Type 'WSAStartup / WSACleanup(API) Private Declare PtrSafe Function WSAStartup Lib "Ws2_32.dll" (ByVal wVersionRequested As Integer, ByRef lpWSADATA As WSADATA) As Long Private Declare PtrSafe Function WSACleanup Lib "wsock32.dll" () As Long '* --- Network --- */ Private Enum AF AF_UNSPEC = 0 AF_INET = 2 AF_IPX = 6 AF_APPLETALK = 16 AF_NETBIOS = 17 AF_INET6 = 23 AF_IRDA = 26 AF_BTH = 32 End Enum Private Enum SOCKTYPE SOCK_STREAM = 1 SOCK_DGRAM = 2 SOCK_RAW = 3 SOCK_RDM = 4 SOCK_SEQPACKET = 5 End Enum Private Enum PROTOCOL IPPROTO_ICMP = 1 IPPROTO_IGMP = 2 BTHPROTO_RFCOMM = 3 IPPROTO_TCP = 6 IPPROTO_UDP = 17 IPPROTO_ICMPV6 = 58 IPPROTO_RM = 113 End Enum ' IPv4 address Private Type SOCKADDR_IN sin_family As Integer sin_port As Integer sin_addr As Long sin_zero1 As Long sin_zero2 As Long End Type Private Const INVALID_SOCKET = -1 Private Const SOCKET_ERROR As Long = -1 'socket / closesocket(API) Private Declare PtrSafe Function SOCKET Lib "wsock32.dll" Alias "socket" (ByVal lngAf As LongPtr, ByVal lngType As LongPtr, ByVal lngProtocol As LongPtr) As Long Private Declare PtrSafe Function closesocket Lib "Ws2_32.dll" (ByVal socketHandle As Long) As Long 'sendto(API) Private Declare PtrSafe Function sendto Lib "Ws2_32.dll" (ByVal s As Long, ByVal buf As String, ByVal length As Long, ByVal Flags As Long, ByRef remoteAddr As SOCKADDR_IN, ByVal remoteAddrSize As Long) As Long 'recvfrom(API) Private Declare PtrSafe Function recvfrom Lib "wsock32.dll" (ByVal SOCKET As LongPtr, ByVal buf As String, ByVal length As LongPtr, ByVal Flags As Long, FromAddr As SOCKADDR_IN, fromAddrSize As Long) As Long 'bind(API) Private Declare PtrSafe Function bind Lib "Ws2_32.dll" (ByVal s As Long, ByRef Name As SOCKADDR_IN, ByVal namelen As Long) As Long 'htons(API) Private Declare PtrSafe Function htons Lib "Ws2_32.dll" (ByVal hostshort As Long) As Integer ' inet_addr(API) IPをドット形式(x.x.x.x)から内部形式に変更 Private Declare PtrSafe Function inet_addr Lib "Ws2_32.dll" (ByVal cp As String) As Long '* --- ioctl --- */ '---ioctl Constants Private Const FIONREAD = &H8004667F Private Const FIONBIO = &H8004667E 'For nonblocking mode Private Const FIOASYNC = &H8004667D Private Const WSAEWOULDBLOCK = 10035 'ioctlsocket Private Declare PtrSafe Function ioctlsocket Lib "wsock32.dll" (ByVal s As Long, ByVal cmd As Long, argp As Long) As Long '* --- Sleep --- */ Private Declare PtrSafe Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long) 'エラーコードをFormatMessageで可読可能に変換 Public Function GetFormatMessageString(Optional ByVal dwMessageId As Long = 0) As String Dim dwFlags As Long 'オプションフラグ Dim lpBuffer As String 'メッセージを格納するたのバッファ Dim result As Long '戻り値(文字列のバイト数) '引数省略対応｡ If dwMessageId = 0 Then dwMessageId = VBA.Information.Err().LastDllError '未設定の場合はLastDllErrorをセット End If dwFlags = FORMAT_MESSAGE_FROM_SYSTEM Or FORMAT_MESSAGE_IGNORE_INSERTS Or FORMAT_MESSAGE_MAX_WIDTH_MASK lpBuffer = String(1024, vbNullChar) result = FormatMessage(dwFlags, 0&, dwMessageId, 0&, lpBuffer, Len(lpBuffer), 0&) If (result > 0) Then lpBuffer = Left(lpBuffer, InStr(lpBuffer, vbNullChar) - 1) 'Null終端まで取得 Else lpBuffer = "" End If GetFormatMessageString = lpBuffer & "(" & dwMessageId & ")" End Function 'C言語 MAKEWORD 相当 Public Function MAKEWORD(Lo As Byte, Hi As Byte) As Integer MAKEWORD = Lo + Hi * 256& Or 32768 * (Hi > 127) End Function Public Sub UDPRecvFrom() Dim ip As String: ip = "127.0.0.1" Dim remotePort As Long: remotePort = 60021 Dim RetCode As Long Dim remoteAddr As SOCKADDR_IN Dim ListenSocketHandle As Long Const RecvBuffSize As Long = 2048 Dim recvBuffer As String * RecvBuffSize Dim recvResult As Long Dim WSAD As WSADATA RetCode = WSAStartup(MAKEWORD(2, 2), WSAD) If RetCode <> 0 Then MsgBox "WSAStartup failed with error：" & GetFormatMessageString(RetCode) Exit Sub End If ListenSocketHandle = SOCKET(AF.AF_INET, SOCKTYPE.SOCK_DGRAM, PROTOCOL.IPPROTO_UDP) If ListenSocketHandle = INVALID_SOCKET Then MsgBox "SOCKET failed with error：" & GetFormatMessageString(Err.LastDllError) GoTo EXIT_POINT End If remoteAddr.sin_family = AF_INET remoteAddr.sin_addr = inet_addr(ip) remoteAddr.sin_port = htons(remotePort) RetCode = bind(ListenSocketHandle, remoteAddr, LenB(remoteAddr)) If RetCode = SOCKET_ERROR Then MsgBox "Error binding listener socket: " & GetFormatMessageString(Err.LastDllError) GoTo EXIT_POINT End If RetCode = ioctlsocket(ListenSocketHandle, FIONBIO, -1) 'non-broking If RetCode = SOCKET_ERROR Then MsgBox "Error nonblocking mode Setting" GoTo EXIT_POINT End If Do While True DoEvents Sleep 200 recvResult = recvfrom(ListenSocketHandle, recvBuffer, RecvBuffSize, 0, remoteAddr, LenB(remoteAddr)) If (recvResult > 0) Then Debug.Print recvResult MsgBox "サーバー 受信成功:" & recvBuffer Exit Do '受信成功したらループを抜ける ElseIf recvResult = SOCKET_ERROR Then 'ノンンブロッキングもの以外のエラーはループを抜ける。 If Not Err.LastDllError = WSAEWOULDBLOCK Then MsgBox "SOCKET_ERROR " & GetFormatMessageString(Err.LastDllError) GoTo EXIT_POINT: End If End If Loop EXIT_POINT: If closesocket(ListenSocketHandle) = SOCKET_ERROR Then MsgBox "closesocket failed with error：" & GetFormatMessageString(Err.LastDllError) End If If WSACleanup() <> 0 Then MsgBox "Windows Sockets error occurred in Cleanup.", vbExclamation End If End Sub Public Sub UDPSendTo() ' WSAStartup -> socket → sendto → closesocket WSACleanup Dim RetCode As Long Dim WSADATA As WSADATA Dim SendSocketHandle As Long Dim DstAddr As SOCKADDR_IN 'パラメータ Dim ip As String: ip = "127.0.0.1" Dim TargetPort As Long: TargetPort = 60021 Dim strbuffer As String strbuffer = "test " & Now() 'スタートアップ RetCode = WSAStartup(MAKEWORD(2, 2), WSADATA) If RetCode <> 0 Then MsgBox "WSAStartup failed with error：" & GetFormatMessageString(RetCode) Exit Sub End If 'UDP socket SendSocketHandle = SOCKET(AF.AF_INET, SOCKTYPE.SOCK_DGRAM, PROTOCOL.IPPROTO_UDP) If SendSocketHandle = INVALID_SOCKET Then MsgBox "SOCKET failed with error：" & GetFormatMessageString(Err.LastDllError) GoTo EXIT_POINT End If DstAddr.sin_family = AF.AF_INET DstAddr.sin_addr = inet_addr(ip) DstAddr.sin_port = htons(TargetPort) 'sendto 送信 RetCode = sendto(SendSocketHandle, strbuffer, Len(strbuffer), 0, DstAddr, Len(DstAddr)) If RetCode = SOCKET_ERROR Then MsgBox "sendto failed with error：" & GetFormatMessageString(Err.LastDllError) GoTo EXIT_POINT End If EXIT_POINT: If closesocket(SendSocketHandle) = SOCKET_ERROR Then MsgBox "closesocket failed with error：" & GetFormatMessageString(Err.LastDllError) End If If WSACleanup() <> 0 Then MsgBox "Windows Sockets error occurred in Cleanup.", vbExclamation End If End Sub |
コメント